neocell said:
Just curious about what ever happened to the duo line. Thought that there'd be some knowledgeable folk in the forums that could give some background to it and why it's no longer.
I use a PowerBook Duo 2300c as my school system and have been using the Duos for years (I've owned the 230, 270c, 280 and 280c in addition to my 2300c).
As has been pointed out, it was always one computer (the PowerBook) with a docking station.
As for what the Dock provided, it had built-in video (512k of VRAM), a floppy drive, SCSI (both internal for an extra hard drive on later Docks and external for connecting to peripherals), an FPU (for Duos that didn't have one built into the system) and two Nubus slots (I have a video card and ethernet card in mine).
The idea was that you could have a Dock and monitor at work (or both work and home) and the PowerBook could be used just about anywhere. It was mobile computing while having a desktop like setup.
As for what happen to the line, it was replaced with the PowerBook 2400c (which was a PowerBook 3400c in a 4.4 pound form factor), but rather than use a Dock, it was designed as a stand alone PowerBook.
The real advantage of the Duos was size (they were classified as subnotebooks). At less than 5 pounds, it was the lightest PowerBook you could get. Also the 280 Duos were faster than the top of the line standard PowerBooks of the time, the 540c/540 even though they ran at the same clock speed (68LC040 at 33 MHz).
The physical specs of the Duos:
Color Duos: 1.5" x 10.9" x 8.5" at 4.8 pounds
Grayscale Duos: 1.4" x 10.9" x 8.5" at 4.2 pounds
and the system that replaced them:
PowerBook 2400c: 1.9" x 10.5" x 10.5" at 4.4 pounds